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ISSN : 1229-3059(Print)
ISSN : 2287-2302(Online)
Journal of the Computational Structural Engineering Institute of Korea Vol.32 No.1 pp.17-27

A Numerical Study on Improvement in Seismic Performance of Nuclear Components by Applying Dynamic Absorber

Shinyoung Kwag1†,Jinsung Kwak2,Hwanho Lee2,Jinho Oh2,Gyeong-Hoi Koo3
1Structural and Seismic Safety Research Team, Korea Atomic Energy Research Institute, Daejon, 34057, Korea
2Research Reactor System Engineering Team, Korea Atomic Energy Research Institute, Daejon, 34057, Korea
3SFR System Design Division, Korea Atomic Energy Research Institute, Daejon, 34057, Korea
Corresponding author: Tel: +82-42-868-4523; E-mail:


In this paper, we study the applicability of Tuned Mass Damper(TMD) to improve seismic performance of piping system under earthquake loading. For this purpose, a mode analysis of the target pipeline is performed, and TMD installation locations are selected as important modes with relatively large mass participation ratio in each direction. In order to design the TMD at selected positions, each corresponding mode is replaced with a SDOF damped model, and accordingly the corresponding pipeline is converted into a 2-DOF system by considering the TMD as a SDOF damped model. Then, optimal design values of the TMD, which can minimize the dynamic amplification factor of the transformed 2-DOF system, are derived through GA optimization method. The proposed TMD design values are applied to the pipeline numerical model to analyze seismic performance with and without TMD installation. As a result of numerical analyses, it is confirmed that the directional acceleration responses, the maximum normal stresses and directional reaction forces of the pipeline system are reduced, quite a lot. The results of this study are expected to be used as basic information with respect to the improvement of the seismic performance of the piping system in the future.

동흡진기 적용을 통한 원전기기의 내진성능향상에 관한 수치적 연구

1한국원자력연구원 구조지진안전연구실, 2한국원자력연구원 연구로설계종합실, 3한국원자력연구원 SFR계통설계부